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Finding the Fourth Proportional to 7,319.70, 10,978.79 and 2,389.55

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Solution

The fourth proportional to 7,319.70, 10,978.79 and 2,389.55 is: 3,584.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,319.70 : 10,978.79 = 2,389.55 : x
  2. Step 2: Convert to fraction form
    7,319.70/10,978.79 = 2,389.55/x
  3. Step 3: Cross multiply
    7,319.70x = 10,978.79 × 2,389.55
  4. Step 4: Simplify right side
    7,319.70x = 26,234,300.80
  5. Step 5: Solve for x
    x = 26,234,300.80/7,319.70
  6. Step 6: Final answer
    x = 3,584.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.